Hacktoberfest is a monthly-long celebration of open source software run by DigitalOcean, welcoming developers from around the world to participate in contributing to open source projects hosted on GitHub. The event offers a free t-shirt for participants who make five pull requests between October 1-31. To help new contributors learn the basics, TwilioQuest has created a brand-new mission to teach basic git commands and workflows necessary for submitting code contributions to a repository. Participants can sign up anytime between October 1 and October 31 and can submit pull requests to any public GitHub-hosted repositories/projects, with PRs reported by maintainers as spam or automated not counting towards the shirt. The event aims to encourage developers of all skill levels to participate in open source software development.